The [wiki:Commentary/Libraries boot libraries] are built as part of building GHC; they are built with the stage1 compiler, and imported when the stage2 compiler is compiled with stage1.

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All other libraries are stand-alone Cabal packages, and the build system knows nothing about them. Nevertheless, it is common to want to install extra packages for the GHC in your build tree. Here are [wiki:Debugging/InstallingPackages instructions for how to do so].

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All other libraries are stand-alone Cabal packages, and the build system knows nothing about them. Nevertheless, it is common to want to install extra packages for the GHC in your build tree. Here are [wiki:Debugging/InstallingPackagesInplace instructions for how to do so].